#region Copyright (C) 2005 - 2008 Giacomo Stelluti Scala
//
// Command Line Library: OptionAttribute.cs
//
// Author:
//   Giacomo Stelluti Scala (giacomo.stelluti@gmail.com)
//
// Copyright (C) 2005 - 2008 Giacomo Stelluti Scala
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion

namespace SMS.CommandLine
{
        using System;
        using System.Reflection;

        /// <summary>
        /// Models an option specification.
        /// </summary>
        [AttributeUsage(AttributeTargets.Field,
                AllowMultiple = false,
                Inherited = true)]
        public sealed class OptionAttribute : BaseOptionAttribute
        {
                private string uniqueName;

                /// <summary>
                /// Initializes a new instance of the <see cref="SMS.CommandLine.OptionAttribute"/> class.
                /// </summary>
                /// <param name="shortName">The short name of the option or null if not used.</param>
                /// <param name="longName">The long name of the option or null if not used.</param>
                public OptionAttribute(string shortName, string longName)
                {
                        if (!string.IsNullOrEmpty(shortName))
                        {
                                this.uniqueName = shortName;
                        }
                        else if (!string.IsNullOrEmpty(longName))
                        {
                                this.uniqueName = longName;
                        }

                        if (this.uniqueName == null)
                        {
                                throw new InvalidOperationException();
                        }

                        this.ShortName = shortName;
                        this.LongName = longName;
                }

#if UNIT_TESTS
                internal OptionInfo CreateOptionInfo()
                {
                        return new OptionInfo(this.ShortName, this.LongName);
                }
#endif

                internal string UniqueName
                {
                        get { return this.uniqueName; }
                }
        }
}
